User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.66 Safari/537.36 Steps to reproduce: Play web audio with the following setup: AudioNode -> GainNode -> Panner -> context.destination panner.panningModel = "equalpower"; panner.setPosition(0, 0, -0.5); GainNode.gain.value = 0; Actual results: gain is only applied to right channel of head phones. So 0 gain is not applied to L channel, meaning you can still hear audio. Expected results: Should not be able to hear sound. Gain should be applied to all channels. This may be related to previously resolved bug: https://bugzilla.mozilla.org/show_bug.cgi?id=849918

Note that if I connect the nodes in the opposite order, everything works as expected. AudioNode -> Panner -> GainNode -> context.destination

Can confirm the bug as reproduceable.

Stereo gain is a bit more complex. http://hg.mozilla.org/mozilla-central/annotate/effa95701c83/content/media/AudioNodeEngine.cpp#l212 The gain should be applied together with distance and cone gain. http://hg.mozilla.org/mozilla-central/annotate/effa95701c83/content/media/webaudio/PannerNode.cpp#l366

https://hg.mozilla.org/integration/mozilla-inbound/rev/2b9dfa78a4c7 https://hg.mozilla.org/integration/mozilla-inbound/rev/be857f605b78 https://hg.mozilla.org/integration/mozilla-inbound/rev/6cf335169e81 https://hg.mozilla.org/integration/mozilla-inbound/rev/9af6d5c67f34

https://hg.mozilla.org/mozilla-central/rev/2b9dfa78a4c7 https://hg.mozilla.org/mozilla-central/rev/be857f605b78 https://hg.mozilla.org/mozilla-central/rev/6cf335169e81 https://hg.mozilla.org/mozilla-central/rev/9af6d5c67f34